A process for electroplating chromium to improve the hardness of connector terminals

By using electroplating solutions and processes involving trivalent chromium salts and nanoparticles, a composite reinforced coating is formed, solving the problems of insufficient hardness in trivalent chromium electroplating and environmental issues in hexavalent chromium electroplating. This achieves a high-hardness, high-wear-resistance, and environmentally friendly electroplating process.

CN120006288BActive Publication Date: 2026-06-26DONGGUAN YUSEN PRECISION TERMINAL
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Patent Information

Application Number
CN202510158713.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-02-13
Publication Date
2026-06-26
Estimated Expiration
2045-02-13

AI Technical Summary

Technical Problem

Existing trivalent chromium electroplating processes result in insufficient coating hardness, while hexavalent chromium electroplating poses environmental and safety risks and cannot meet the wear resistance and stability requirements of high-end electronic products.

Method used

An electroplating solution containing trivalent chromium salts, boron nitride nanoparticles, iron tetroxide nanoparticles, nickel ions, and sodium dichromate is used, combined with ultrasonic cleaning, heat treatment, passivation treatment, and low-temperature treatment to form a composite reinforced coating. A titanium nitride protective layer is then sprayed onto the surface of the chromium plating layer.

Benefits of technology

It improves the hardness, wear resistance, corrosion resistance and adhesion of the coating, reduces the toxicity of hexavalent chromium, meets the performance requirements of high-end electronic products, and improves the environmental protection and safety of the electroplating process.

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Abstract

The application relates to the technical field of electroplating, and discloses a chromium electroplating process for improving the hardness of a connector terminal, which comprises the following steps: performing surface pretreatment on the connector terminal, removing surface impurities through ultrasonic cleaning and micro-etching treatment; performing heating treatment on the connector terminal; performing electroplating treatment on the connector terminal by using an electroplating solution comprising trivalent chromium salt, boron nitride nanoparticles, ferroferric oxide nanoparticles, nickel ions, sodium dichromate and chromium alloy additives, so as to form a chromium plating layer; performing passivation treatment on the plating layer; performing low-temperature treatment on the plating layer; and spraying a protective layer on the chromium plating layer. Through the trivalent chromium salt and the sodium dichromate, the trivalent chromium salt is used to reduce hexavalent chromium ions into trivalent chromium, the toxicity of the hexavalent chromium is reduced, the sodium dichromate is used to provide a stable chromium source, the deposition of chromium elements in the electroplating process is ensured, the pollution of hexavalent chromium to the environment and the harm of hexavalent chromium to the health of operators are solved, and the environmental protection and safety of the electroplating process are improved.
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